Any app that can help me to practice this course on computer

Answer 1

If u mean IDE, well, there are a lot of options out there.
MS visual studio
dev C++
Code::Block
XCode
etc.

Just do a little googling about your target language and you'll find some solutions to your case.
Unfortunately, sololearn compilers have some limitations. Most importantly, lack of debugging mode in order to tracing you code.

Answer 2

no app
use Sololearn.com website on computer

Answer 3

I used Netbeans, its free :D